Which one of the following statements about a satellite orbiting around the Earth is correct ........

General Science (NDA) Physics

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Which one of the following statements about a satellite orbiting around the Earth is correct

Satellite is kept in orbit by remote control from ground station.

Satellite is kept in orbit by retro-rocket and solar energy keeps it moving around the Earth.

Satellite requires energy from solar panels and solid fuels for orbiting.

Satellite does not require any energy for orbiting.

Explanation:

A satellite rotates around the earth by using earth's gravitational force as centripetal force. Also as there is no air in space, it does not have to work against air resistance. Hence it doesn't lose any energy while rotating. So it does not require fuel/energ to rotate around the earth.